What are the Types of Linkage ?
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Types of linkage
↪Complete linkage
The genes located on the same chromosome do not separate and are inherited together over the generations due to the absence of crossing over.
Complete linkage allows the combination of parental traits to be inherited as such.
It is rare but has been reported in male Drosophila and some other heterogametic organisms.
Incomplete linkage
Genes present in the same chromosome have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type.
The number of recombinant individuals is usually less than the number expected in independent assortment.
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TYPES OF LINKAGE
(1) Complete linkage:
♦When genes remain together on the same chromosome for two or more generations, linkage is said to be complete.
♦It is rare in nature.
♦e.g. Eye colour and wing shape in male Drosophila.
(2) Incomplete linkage:
♦When the genes present on same chromosome do not remain linked and separate due to crossing over, linkage is said to be incomplete.
♦It is common in nature.
♦Incomplete linked genes undergo crossing over and produce recombinant.
♦e.g. Eye colour and wing shape in female Drosophila.
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